Missing plugins? - SpamAssassin

This is a discussion on Missing plugins? - SpamAssassin ; Hi,
I have SpamAssassin version 3.1.9 running on Perl version 5.8.8,
Centos 5.1 OS. SpamAssassin has run perfectly so far.
However, this monday I repeated the usual procedure to train the filters
and received a lot of errors, similar to ...